feat: add web using egui and libp2p-floodsub

Unfortunately, libp2p-gossipsub doesn't support WASM well currently.
That's why I used libp2p-floodsub instead. For more details, please see #4 (comment)

Cargo.toml

@@ -1,26 +1,12 @@
-[package]
-name = "jiri"
-version = "0.0.1"
-edition = "2021"
+[workspace]
+members = [
+  "standalone",
+  "web",
+]
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[profile.release]
+opt-level = 2 # fast and small wasm
 
-[dependencies]
-async-channel = "1.8.0"
-async-std = { version = "1.12", features = ["attributes"] }
-async-trait = "0.1"
-bytes = "1.4.0"
-clap = { version = "4.2.1", features = ["derive"] }
-env_logger = "0.10"
-futures = "0.3.28"
-libp2p = { version = "0.51.3", features = ["async-std", "dns", "mdns", "kad", "noise", "macros", "request-response", "tcp", "websocket", "yamux", "gossipsub"] }
-log = "0.4.17"
-multiaddr = { version = "0.17.1" }
-serde = { version = "1.0.160", features = ["derive"] }
-serde_derive = "1.0.160"
-serde_json = "1.0.96"
-tokio = { version = "1.27.0", features = ["full"] }
-warp = "0.3.4"
-
-[dev-dependencies]
-dockertest = "0.3.1"
+[profile.dev]
+debug = 2
+opt-level = 0